THE INVESTIGATION OF THE AL7075 + 1 WT. % ZR ALLOY PREPARED USING SPARK PLASMA SINTERING TECHNOLOGY

1 MOLNÁROVÁ Orsolya
Co-authors:
1 MÁLEK Přemysl 2 BECKER Hanka
Institutions:
1 Charles University in Prague, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 12116, Prague 2, Czech Republic, e-mail: malek@met.mff.cuni.cz
2 Institute of Materials Science, TU Bergakademie Freiberg, 09599 Freiberg,Germany, e-mail: *mopersze@gmail.com
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
1221-1226
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
366 views / 142 downloads
Abstract

The microstructure and mechanical properties of powder metallurgical Al7075 alloy modified by the addition of 1 wt. % Zr were studied. The gas atomized powder was consolidated by spark plasma sintering (SPS) to a fully dense compact. The powder particles of the typical size below 50 μm had a cellular to columnar or equiaxed dendritic microstructure (the size in the order of μm) with a large fraction of intermetallic phases at the boundaries. During sintering at 500 °C for 3 min the grain structure remained nearly unchanged. Optical microscopy revealed a bimodal microstructure. The grain size remained unchanged during annealing at even 500 °C for 10 hours. The microhardness of the SPS compact material was 150 HV. The annealing at 500 °C for 10 hours resulted in a decrease of microhardness to 110 HV. Natural aging at room temperature gradually enhanced the microhardness to its initial value. Tensile tests performed on naturally aged samples at room temperature revealed a brittle behaviour. Ductility of 14 % was found at 500 °C. Both the measurements of the strain rate sensitivity parameter m and results of light and scanning electron microscopy revealed the operation of grain boundary sliding.

Keywords: Al7075 alloy, zirconium, spark plasma sintering, powder metallurgy

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